freeCodeCamp/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/basic-javascript/add-new-properties-to-a-javascript-object.md

id, challengeType, videoUrl, forumTopicId, localeTitle

id	challengeType	videoUrl	forumTopicId	localeTitle
56bbb991ad1ed5201cd392d2	1	https://scrimba.com/c/cQe38UD	301169	给对象添加新属性

Description

你也可以像更改属性一样给对象添加属性。 看看我们是如何给ourDog添加"bark"属性： ourDog.bark = "bow-wow"; 或者 ourDog["bark"] = "bow-wow"; 现在当我们访问ourDog.bark时会得到 ourDog 的 bark 值 "bow-wow".

Instructions

给myDog添加一个"bark"属性，设置它的值为狗的声音，例如："woof"。你可以使用点或中括号操作符。

Tests

tests:
  - text: 给<code>myDog</code>添加<code>"bark"</code>属性。
    testString: assert(myDog.bark !== undefined);
  - text: 不能在初始化 myDog 的时候添加<code>"bark"</code>属性。
    testString: 'assert(!/bark[^\n]:/.test(code));'

Challenge Seed

// Example
var ourDog = {
  "name": "Camper",
  "legs": 4,
  "tails": 1,
  "friends": ["everything!"]
};

ourDog.bark = "bow-wow";

// Setup
var myDog = {
  "name": "Happy Coder",
  "legs": 4,
  "tails": 1,
  "friends": ["freeCodeCamp Campers"]
};

// Only change code below this line.

After Test

(function(z){return z;})(myDog);

Solution

var myDog = {
  "name": "Happy Coder",
  "legs": 4,
  "tails": 1,
  "friends": ["freeCodeCamp Campers"]
};
myDog.bark = "Woof Woof";